Evaporator



March 19, 1935. s. s. BATTLES EVAPORATOR Filed Jan. 14, 1935 -37'EWAET5. BATTL E5.

Patented Mar. 19, 1935 I 1,995,167 EVAPORATOR Stewart S. Battles,Chicago, Ill., assignor to Ingersoll Steel and Disc 00., Chicago, Ill.,-a corporation of Illinois Application January 14, 1933, Serial No.651,715

13 Claims. (01. 62-126) UNITED STATES PATENT; OFFICE This inventionrelates to refrigeration and will pable of holding a tray or container18 for mabe described as incorporated in a cooling unit terials to berefrigerated. The inner shell 15 as for a refrigerator and the method ofconstructillustrated in Figures and 6 has formed ading th me, jacent therear end, an outwardly flared flange 5 An object of this invention isthe provision of 19, for engagement by the ends 21 of the coil 6 animproved method of constructing a cooling loops. The outer shell 22 issimilarlyformed of unit for a refrigerator so as to minimize the time asingle sheet of metal and has formed thereon and labor required and tosimplify and reduce an inwardly extending flange 23 forengagement thenumber of operations necessary for the proover the ends 24 of the coilloops. With the duction of an improved cooling unit. shells thus formed,the coil 25 formed of a single 0 Another object of this invention is theprometal tube by bending portions intermediate the vision of an improvedmethod of constructing a ends, back and forth forming loops, shorterthan cooling unit of two metal shells with an. ex-' the shells, andadapted for firm engagement with pansion coil interposed therebetween,in a manthe flanges 19 and 23 of the shells, is then placed ner tofacilitate the assembly and insure eflicient upon the inner shell, withthe ends 28 of the 15 heat transfer engagement between the expansioncoil extending beyond the rear end of the shells. coil and the shellsboth on the outer and inner While the expansion coil is in thisposition, the faces of the coil and at the ends of the coil to outershell is sleeved over the irmer shell and hold the coil permanently inposition and to inthe coil, from the front end of the inner shell,crease the efliciency of the unit. until he fl n e 23 firmly engages theend 24 of 20 A further object is the provision of a cooling the coilloop. With the shells in this position, unit for a refrigeratorcomprising means intethe marginal edge at the front end of the innergral with the sheet metal shells, for securely hold shell is rolled overthe marginal edge 32 of the ing the ends of the coil loops in positionadjacent outer shell thereby forming a reversely extending 5 the ends ofthe unit and providing means for flange 31 engaging over the marginaledge 32 of permanently sealing the shells together and to the outershell. In a similar manner the marthe ends of the coil to preventdisplacement of ginal edge of the outer shell at the rear endof the sameand form an airtight space between the the unit is rolled over themarginal edge 35 of the shells in which the coil is disposed, which mayinner shell, thus forming a reversely extending be evacuated to increasethe eificiency of the enflange 34 engaging over the marginal edge 35 30gagement between the coil and the shells. of the inner shell.

Other objects and advantages of this invention With the shells thussecured together by interwill become apparent from the following detaillocking of the edges, they are sealed together by description togetherwith the accompanying solder or similar readily fusible metal asindicated 35 drawing. 7 at 37 and 38. In order to, securely hold thecoil 5 On the drawing: 25 in place, and to provide means for connectingFigure l is a top plan view of a cooling unit a pipe thereto, a suitablepipe coupler 41 is fitted for a refrigerator incorporating my invention.over each end of the coil and securely soldered Figure 2 is a verticalsection through the unit, as illustrated at 42, 43 and 44, to the coil25, to 4 taken on the line II-II of Fig. 1. the outer and inner shell 22and 16 and to a rear Figure 3 is a side elevation of that shown in wallplate 45, thereby holding them all rigidly Figure 2 with portions of theouter shell broken together. The rear wall plate 45' is preferably awayand portions shown insection. formed of a single sheet of metal, with anin- Figures 4, 5 and 6 are fragmentary sections wardly offset portion 46engageable with the 45 illustrating details of construction which willbe flange 19 on the irmer shell and with the flange 45 hereinafterdescribed more in detail. 34 and the solder 38 as illustrated in Figure6.

As shown on the drawing: The plate 45 is also provided with a flange 47,

The details of construction of this invention the rearward edge of whichis sealed to the flange will be best understood from a description of 34by solder as indicated at 48.

50 the method of constructing the same. The cool- In order topermanently press or collapse the 50 ing unit illustrated in the drawingcomprises an shells 15 and 22 upon the coil 25, the shells are innermetal shell 15 which is preferably formed formed of relatively flexiblematerial. A suitable. of a single sheet of metal having formedintesocket member 52 is sealed in the outer shell 22, grally therewith,inwardly extending corrugawhich socket member is adapted to receive aplug tions 16 which serve to support a shelf 17, ca- 53 or the like forclosing the same. After the unit 55 has been otherwise completed, theair is evacuated from between the shells and 22 and theplug53placedinthesocket52tomaintaina vacuum between the shells andsecurely hold the shells in a firm and intimate contact with the coil25.

Having described my invention together with the process of constructingthe same, it will be understood by those skilled in the art, thatvarious changes and modifications may be made without departing from theprinciple of the invention and I desire that the patent to be grantedhereon shall not be limited in any manner except as necessitated by theprior art.

I claim as my invention:

1. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending, loops, each saidshell including a flanged portion snugly engaging the ends of the loops.means sealing the shells together at their marginal edges to form anair-tight space between the shells which may be evacuated.

2. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, each said shellincluding a flanged portion snugly engaging the ends of the loops, meanssealing the shells together at their marginal edges to form an air-tightspace between the shells which may be evacuated, the ends of theexpansion coil extending from the shells and coupling means permanentlysealed to the shells and to the ends of the coil.

3. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, each said shellincluding a flanged portion snugly engaging the ends of the loops, meanssealing the shells together at their marginal edges to form an air-tightspace between the shells which may be evacuated, a metal plate closingone end of the unit and soldered in place to form a permanent rear wall.

4. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, each said shellincluding a flanged portion snugly engaging the ends of the loops, meanssealingthe shells together at their marginal edges to form an air-tightspace between theshells which may be evacuated, the ends of theexpansion coil extending from the shells, coupling means permanentlysealed to the shells and to the ends of the coil, a metal plate closingthe rear end ofthe unit and soldered in place to form a permanent wall.

5. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, each said shellincluding a flanged portion snugly engaging the ends of the loops, meanssealing the shells together at their marginal edges to form an air-tightspace between the shells which may be evacuated, and

means integral with the inner shell providing shelf-supports for holdingmaterials to' be refrigerated.

6. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection. a metal expansion coil disposed between the shellsand,including a plurality of longitudinally extending loops, each saidshell including a flanged portion snugly engaging the ends of the loops,means sealing the shells together at their marginal edges to formanair-tight space between the shells which may be evacuated, the ends ofthe expansion coil extending from the shells, coupling means permanentlysealed to the shells and to the ends of the coil, and means integralwith the inner shell providing shelf supports for holding materials tobe refrigerated.

7. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, each said shellincluding a flanged portion snugly engaging the ends of the loops, meanssealing the shells together at their marginal .edges to form anair-tight space between the shells-which may be evacuated, a metal plateclosing one end of the unit and soldered in place to form'a permanentrear wall, and means integral with the inner shell providing shelfsupports for holding materials to be refrigerated.

8. In a. cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, the inner shellincluding an outwardly curved flange adjacent the rear end snuglyfitting over the rear end of the coil loops, the outer shell includingan inwardly curved flange adjacent the front end snugly fltting over thefront end of the coil loops, the marginal edge of the inner shell at thefront end reversely extending and engaging over the correspondingmarginal edge of the outer shell, the marginal edge of the outer shellreversely extending and engaging over the corresponding edge of theinner shell, means for sealingly securing the shells together adjacentthe ends of the coil loops to provide an air-tight space therebetweenwhich may be evacuated. V

9. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, the inner shellincluding an outwardly curved flange adjacent the rear end snuglyfitting over the rear end of the coil loops,

the outer shell including an inwardly curved flange adjacent the frontend snugly fltting over the front end oi the coil loops, the marginaledge of the inner shell at the front end reversely extending andengaging over the corresponding marginal edge of the outer shell, meansfor sealingly securing the shells together adjacent the ends of the coilloops to provide an air-tight space therebetween which may be evacuated.

10. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between "the shells andincluding a plurality of longitudinally extending loops, the inner shellincluding an outwardly curved flange adjacent the rear end snuglyfitting over the rear end of the coil loops, the outer shell includingan inwardly curved flange adjacent the front end snugly fitting over thefront end of the coil loops, the marginal edge of the inner shell at thefront end reversely extending and engaging over the correspondingmarginal edge of the outer shell, means for sealingly securing theshells together adjacent the ends of the coil loops to provide anairtight space therebetween which may be evacuated, the ends of theexpansion coil extending from the shells and coupling means permanentlysealed to the shells and to the ends of the coil.

11. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinallyextending loops, the inner shellincluding an outwardly curved flange adjacent the rear end snuglyfitting over the rear end of the coil loops, the outer shell includingan inwardly curved flange adjacent the front end snugly fitting over thefront end of the coil loops, the marginal edge of the inner shell at thefront end reversely extending and engaging over the correspondingmarginal edge of the outer shell, the marginal edge of the outer shellreversely extending and engaging over the corresponding edge of theinner shell, means for sealingly securing the shells together adjacentthe ends of the coil loops to provide an air-tight space therebetweenwhich may be evacuated, the ends of the expansion coil extending fromthe shells, coupling means permanently sealed to the shells and to theends of the coil, and a metal plate closing one end of the unit andsoldered in position to form a permanent wall.

12. In a cooling unit for a refrigerator, an inner metal shell and anouter metal shell, said shells being substantially rectangular incrosssection, a metal expansion coil disposed between the shells andincluding a plurality of longitudinally extending loops, the inner shellincluding an outwardly curved flange adjacent the rear end snuglyfitting over the rear end of the coil loops, the outer shell includingan inwardly curved flange adjacent the front end snugly fitting over thefront end of the coil loops, the marginal edge of the inner shell at thefront end reversely extending and engaging over the correspondingmarginal edge of the outer shell, means for sealingly securing theshells together adjacent the ends of the coil loops to provide anair-tight space therebetween which may be evacuated, the ends of theexpansion coil extending from the shells, coupling means permanentlysealed to the shells and to the ends of the'coil, a metal plate closingthe rear end of the unit and permanently fixed in position to form awall, and means integral with the inner shell providing shelf supportsfor holding materials to be refrigerated.

13. A cooling unit for a refrigerator comprising an inner metal shelland an outer metal shell in spaced relation from each other, each ofsaid shells having a flange joined with the other shell to hold the samein spaced relation therefrom, and a metal expansion coil loopedlongitudinally between the shells and having curved portions thereofsnugly engaging the flanges of the shells to hold the coil in position.

STEWART S. BATTLES.

